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QOTD: Unripe lychee fruit contain a compound called hypoglycin

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QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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Unripe lychee fruit contain a compound called hypoglycin, which is poisonous in large quantities. No amount of ripe lychee fruit, however, contains enough hypoglycin to harm human health. In response to recent deaths of consumers who ate unripe lychee fruit, scientists have recently developed an alternative type of lychee fruit, called lychee-B, that, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees. Therefore, unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size.

In order for the conclusion to be properly drawn, which of the following must be assumed?

A) Unripe lychee-B fruits do not contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees.

B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits.

C) During the process of ripening, conventional lychee fruits lose a higher proportion of their hypoglycin than do lychee-B fruits.

D) Eating a large number of Lychee-B fruits is not harmful to human health.

E) Consumers who typically enjoy ripened, conventional lychee fruit would be willing to eat unripe lychee-B fruits.
[Reveal] Spoiler: OA

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QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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New post 20 Oct 2017, 02:23
IMO answer is B.
B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits.
If average size of lychee-B is more than conventional lychee fruits, the argument falls apart. Then lychee-B will contain more hypoglycin than conventional lychees.

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QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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A) Unripe lychee-B fruits do not contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees.
CORRECT. Negate this answer choice: "Unripe lychee-B fruits DO contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees." , argument breaks down, the new kind of lychee will definitely NOT be as safe for consumption as the old type.

B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits.
Take a look at the last part of the last sentence in the argument, we are comparing lychees of similar size. Hence, the size issue disappears.

C) During the process of ripening, conventional lychee fruits lose a higher proportion of their hypoglycin than do lychee-B fruits.
Proportion is irrelevant. Final outcome is that Lychee B has lower hypoglycin than the conventional lychee.

D) Eating a large number of Lychee-B fruits is not harmful to human health.
Already established.

E) Consumers who typically enjoy ripened, conventional lychee fruit would be willing to eat unripe lychee-B fruits.
Irrelevant. We aren't testing "willingness" here, we are testing safety.

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Re: QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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New post 23 Oct 2017, 02:04
+1 for A. This one was a tough one phew !! . My take :

Premise : Unripe lychee contains a certain amount of poisonous substance which ripe lychee does not. To overcome this problem , scientists have developed a new variant of lychee that does not contain this poisonous substance whether it is ripe or not.

Conclusion : Unripe variant is at least as safe as ripe lychee of same size.

Prethink : This is an assumption type question. What if the variant contains some other poisonous substance ? The conclusion compares fruits of the same size. So any option that does talks about the size of fruit will not be correct.

POE :

Option a : On the lines of our pre-think. Satisfies the negation test as well.
Option b : We are comparing fruits of the same size.
Option c : Irrelevant.
Option d : Stated already.
Option e : Irrelevant.

Hence by POE , option A is the correct answer.
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QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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souvik101990 wrote:
Unripe lychee fruit contain a compound called hypoglycin, which is poisonous in large quantities. No amount of ripe lychee fruit, however, contains enough hypoglycin to harm human health. In response to recent deaths of consumers who ate unripe lychee fruit, scientists have recently developed an alternative type of lychee fruit, called lychee-B, that, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees. Therefore, unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size.

In order for the conclusion to be properly drawn, which of the following must be assumed?

A) Unripe lychee-B fruits do not contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees.
Correct: This option, if negated, gives a reason to say that lychee-B fruits aren't safe to eat. This distorts the conclusion.

B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits.
Irrelevant. Size has no bearing ass it has already been mentioned that "unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size"

C) During the process of ripening, conventional lychee fruits lose a higher proportion of their hypoglycin than do lychee-B fruits.
Irrelevant. This has already been established that "lychee-B, that, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees"

D) Eating a large number of Lychee-B fruits is not harmful to human health.
Extreme.

E) Consumers who typically enjoy ripened, conventional lychee fruit would be willing to eat unripe lychee-B fruits.
Irrelevant: Choice of customers has no bearing. The conclusion is whether the fruits are safe or not.


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Re: QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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New post 25 Oct 2017, 07:59
Unripe lychee fruit contain a compound called hypoglycin, which is poisonous in large quantities. No amount of ripe lychee fruit, however, contains enough hypoglycin to harm human health. In response to recent deaths of consumers who ate unripe lychee fruit, scientists have recently developed an alternative type of lychee fruit, called lychee-B, that, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees. Therefore, unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size.

In order for the conclusion to be properly drawn, which of the following must be assumed?

A) Unripe lychee-B fruits do not contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees. -Lets hold on to this one. It looks good.

B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits. -We are not worried about the size of the fruits.

C) During the process of ripening, conventional lychee fruits lose a higher proportion of their hypoglycin than do lychee-B fruits. -Even if the conventional fruit doesn't loose more hypoglycin the fact that artificial fruit is less harmful than the conventional fruit doesn't change.

D) Eating a large number of Lychee-B fruits is not harmful to human health. -"large number" is exaggerating the option.

E) Consumers who typically enjoy ripened, conventional lychee fruit would be willing to eat unripe lychee-B fruits. -We are not worried about the enjoyment of customers
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Re: QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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New post 18 Nov 2017, 17:54
Yeah, only the GMAT could take something as tasty as lychee fruit and turn it into a not-so-delicious CR question...

The conclusion of this passage is that "unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size." Let's see how the author arrived at that conclusion.

The first two sentences are pretty straightforward:

  • Unripe lychee fruit contain a compound called hypoglycin.
  • Hypoglycin is poisonous in large quantities. In fact, eating unripe lychee fruit can apparently lead to death.
  • No amount of ripe lychee fruit contains enough hypoglycin to harm human health.

So far we can gather that eating unripe lychee fruit might harm your health (or even kill you) if you eat enough of it, though we can't say exactly how much would be unsafe. On the other hand, you can eat as much RIPE lychee fruit as you want and not be harmed by the hypoglycin. Note that this does not necessarily mean that you can eat as much lychee fruit as you want without suffering other negative consequences. All we know for sure is that doing so would not expose you to harm from the hypoglycin.

In response to recent deaths of consumers who ate unripe lychee fruit, scientists developed lychee-B, which, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees. Since lychee-B contains no more hypoglycin than ripened, conventional lychees, we can conclude that you could eat as much ripe OR unripe lychee-B as you want without being harmed by the hypoglycin. As with ripened, conventional lychees, that doesn't mean that you won't suffer OTHER negative consequences from eating lychee-B all day long, but you certainly won't be harmed by the hypoglycin.

Based on this information, the author of the passage concludes that: "unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size." In order for that conclusion to be properly drawn, which of the following must be assumed?

Quote:
A) Unripe lychee-B fruits do not contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees.

Without this assumption, it is possible that unripe lychee-B fruits contain more arsenic, oxalic acid, or other poisonous substances than do ripened, conventional lychees. The information in the passage tells us that if we only consider hypoglycin, lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size. But if lychee-B contains higher quantities of OTHER poisonous substances besides hypoglycin, then lychee-B might be less safe overall than conventional, ripened lychees. Thus, choice (A) looks like a required assumption, so hang on to it.

Quote:
B) Lychee-B fruits are, on average, no bigger than conventional lychee fruits.

The conclusion specifically tells us that we are comparing lychee-B fruits to conventional lychees OF THE SAME SIZE. So even if lychee-B fruits are bigger on average, this would not impact the conclusion. Choice (B) can be eliminated.

Quote:
C) During the process of ripening, conventional lychee fruits lose a higher proportion of their hypoglycin than do lychee-B fruits.

The conclusion compares UNRIPE lychee-B to RIPENED conventional fruits. It makes no difference how much hypoglycin was in the ripened conventional fruit prior to ripening OR how much hypoglycin is lost by a lychee-B during the ripening process. Since we are told that lychee-B, ripe or unripe, contains no more hypoglycin than ripened, conventional lychees, the conclusion is possible, with or without this assumption. Eliminate (C).

Quote:
D) Eating a large number of Lychee-B fruits is not harmful to human health.

As stated above, it is possible that eating a large number of conventional lychee fruits OR a large number of lychee-B fruits is harmful to human health. Choice (D) does not tell us WHICH type is more harmful or how much of each would have to be eaten to cause harmful effects. Thus, it is still possible that unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size. Eliminate (D).

Quote:
E) Consumers who typically enjoy ripened, conventional lychee fruit would be willing to eat unripe lychee-B fruits.

The conclusion of the passage has nothing to do with whether consumers would actually be willing to eat unripe lychee-B fruits. The conclusion simply states that unripe lychee-B fruits are at least as safe to eat as ripened, conventional lychees of the same size. Even if lychee-B fruits were completely tasteless and nobody wants to eat them, the conclusion of the passage would not be impacted. Eliminate (E).

Choice (A) is the best answer.
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Re: QOTD: Unripe lychee fruit contain a compound called hypoglycin [#permalink]

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New post 21 Nov 2017, 04:32
I have a different question for this type of CRs. How can we do it in under 1.45 mins?
I usually take around 2.15 mins for this. How can I reduce this?

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Re: QOTD: Unripe lychee fruit contain a compound called hypoglycin   [#permalink] 21 Nov 2017, 04:32
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